I suggest you ...

Sorting Library in Cover View by all fields and by relative order

It is not currently possible to sort the library (whilst in Cover View) by more than four basic options (recent, most used, title and author). Please could you add all of the additional fields that it's possible to sort by in detail view eg. sort by type or tags etc.

In addition, it would be useful to be able to drag the books around and sort by relative order on their own "shelves" (and have this be remembered) such that the library would work by more visual cues in the manner of a physical book case.

See also https://community.logos.com/forums/t/102876.aspx for my suggestion of showing library field headers in cover view when grouping by such fields as Type, Subject, My Tags. I also took it further and suggested an expansion of Cover View (as a separate view) called "Catalog View" that would include cover images and book descriptions, though that might need to be a separate suggestion; however if work is being done on Cover View it might make sense to fold this into it. See also https://community.logos.com/forums/t/18752.aspx for someone's PDF version of what a Logos Catalog View might look like.

Also, allow sorting by primary and secondary (and so on) fields, like you can in Detail view. Would love to see my Cover View sorted by subject or tag and then alphabetically by author within those groupings.